12 files changed, 56 insertions, 112 deletions

diff --git a/arch/ia64/hp/sim/simserial.c b/arch/ia64/hp/sim/simserial.c
index 626cdc83668b..0e5c6ae50228 100644
--- a/arch/ia64/hp/sim/simserial.c
+++ b/arch/ia64/hp/sim/simserial.c
@@ -46,11 +46,6 @@
 #define KEYBOARD_INTR   3       /* must match with simulator! */
 
 #define NR_PORTS        1       /* only one port for now */
-#define SERIAL_INLINE   1
-
-#ifdef SERIAL_INLINE
-#define _INLINE_ inline
-#endif
 
 #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT)
 
@@ -237,7 +232,7 @@ static void rs_put_char(struct tty_struct *tty, unsigned char ch)
         local_irq_restore(flags);
 }
 
-static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
+static void transmit_chars(struct async_struct *info, int *intr_done)
 {
         int count;
         unsigned long flags;
diff --git a/arch/xtensa/platform-iss/console.c b/arch/xtensa/platform-iss/console.c
index 94fdfe474ac1..2a580efb58ec 100644
--- a/arch/xtensa/platform-iss/console.c
+++ b/arch/xtensa/platform-iss/console.c
@@ -31,10 +31,6 @@
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
 
-#ifdef SERIAL_INLINE
-#define _INLINE_ inline
-#endif
-
 #define SERIAL_MAX_NUM_LINES 1
 #define SERIAL_TIMER_VALUE (20 * HZ)
 
diff --git a/drivers/char/amiserial.c b/drivers/char/amiserial.c
index 7ac365b5d9ec..6602b3156df5 100644
--- a/drivers/char/amiserial.c
+++ b/drivers/char/amiserial.c
@@ -46,8 +46,6 @@
 
 /* Sanity checks */
 
-#define SERIAL_INLINE
-  
 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
  tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
@@ -95,10 +93,6 @@ static char *serial_version = "4.30";
 #include <asm/amigahw.h>
 #include <asm/amigaints.h>
 
-#ifdef SERIAL_INLINE
-#define _INLINE_ inline
-#endif
-
 #define custom amiga_custom
 static char *serial_name = "Amiga-builtin serial driver";
 
@@ -253,14 +247,14 @@ static void rs_start(struct tty_struct *tty)
  * This routine is used by the interrupt handler to schedule
  * processing in the software interrupt portion of the driver.
  */
-static _INLINE_ void rs_sched_event(struct async_struct *info,
-                                  int event)
+static void rs_sched_event(struct async_struct *info,
+                           int event)
 {
         info->event |= 1 << event;
         tasklet_schedule(&info->tlet);
 }
 
-static _INLINE_ void receive_chars(struct async_struct *info)
+static void receive_chars(struct async_struct *info)
 {
         int status;
         int serdatr;
@@ -349,7 +343,7 @@ out:
         return;
 }
 
-static _INLINE_ void transmit_chars(struct async_struct *info)
+static void transmit_chars(struct async_struct *info)
 {
         custom.intreq = IF_TBE;
         mb();
@@ -389,7 +383,7 @@ static _INLINE_ void transmit_chars(struct async_struct *info)
         }
 }
 
-static _INLINE_ void check_modem_status(struct async_struct *info)
+static void check_modem_status(struct async_struct *info)
 {
         unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
         unsigned char dstatus;
@@ -1959,7 +1953,7 @@ done:
  * number, and identifies which options were configured into this
  * driver.
  */
-static _INLINE_ void show_serial_version(void)
+static void show_serial_version(void)
 {
         printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
 }
diff --git a/drivers/isdn/hisax/config.c b/drivers/isdn/hisax/config.c
index df9d65201819..27332506f9f7 100644
--- a/drivers/isdn/hisax/config.c
+++ b/drivers/isdn/hisax/config.c
@@ -25,7 +25,6 @@
 #include <linux/workqueue.h>
 #include <linux/interrupt.h>
 #define HISAX_STATUS_BUFSIZE 4096
-#define INCLUDE_INLINE_FUNCS
 
 /*
  * This structure array contains one entry per card. An entry looks
diff --git a/drivers/isdn/hisax/elsa.c b/drivers/isdn/hisax/elsa.c
index 110e9fd669c5..f8ca4b323331 100644
--- a/drivers/isdn/hisax/elsa.c
+++ b/drivers/isdn/hisax/elsa.c
@@ -108,7 +108,6 @@ static const char *ITACVer[] =
 #define ELSA_ASSIGN      4
 
 #define RS_ISR_PASS_LIMIT 256
-#define _INLINE_ inline
 #define FLG_MODEM_ACTIVE 1
 /* IPAC AUX */
 #define ELSA_IPAC_LINE_LED      0x40    /* Bit 6 Gelbe LED */
diff --git a/drivers/serial/68328serial.c b/drivers/serial/68328serial.c
index 7f0f35a05dca..b88a7c1158af 100644
--- a/drivers/serial/68328serial.c
+++ b/drivers/serial/68328serial.c
@@ -101,8 +101,6 @@ struct tty_driver *serial_driver;
 
 #define RS_ISR_PASS_LIMIT 256
 
-#define _INLINE_ inline
-
 static void change_speed(struct m68k_serial *info);
 
 /*
@@ -262,7 +260,7 @@ static void batten_down_hatches(void)
         /* Drop into the debugger */
 }
 
-static _INLINE_ void status_handle(struct m68k_serial *info, unsigned short status)
+static void status_handle(struct m68k_serial *info, unsigned short status)
 {
 #if 0
         if(status & DCD) {
@@ -289,7 +287,8 @@ static _INLINE_ void status_handle(struct m68k_serial *info, unsigned short stat
         return;
 }
 
-static _INLINE_ void receive_chars(struct m68k_serial *info, struct pt_regs *regs, unsigned short rx)
+static void receive_chars(struct m68k_serial *info, struct pt_regs *regs,
+                          unsigned short rx)
 {
         struct tty_struct *tty = info->tty;
         m68328_uart *uart = &uart_addr[info->line];
@@ -359,7 +358,7 @@ clear_and_exit:
         return;
 }
 
-static _INLINE_ void transmit_chars(struct m68k_serial *info)
+static void transmit_chars(struct m68k_serial *info)
 {
         m68328_uart *uart = &uart_addr[info->line];
 
diff --git a/drivers/serial/au1x00_uart.c b/drivers/serial/au1x00_uart.c
index 29f94bbb79be..948880ac5878 100644
--- a/drivers/serial/au1x00_uart.c
+++ b/drivers/serial/au1x00_uart.c
@@ -133,13 +133,12 @@ static const struct serial_uart_config uart_config[PORT_MAX_8250+1] = {
         { "AU1X00_UART",16,     UART_CLEAR_FIFO | UART_USE_FIFO },
 };
 
-static _INLINE_ unsigned int serial_in(struct uart_8250_port *up, int offset)
+static unsigned int serial_in(struct uart_8250_port *up, int offset)
 {
         return au_readl((unsigned long)up->port.membase + offset);
 }
 
-static _INLINE_ void
-serial_out(struct uart_8250_port *up, int offset, int value)
+static void serial_out(struct uart_8250_port *up, int offset, int value)
 {
         au_writel(value, (unsigned long)up->port.membase + offset);
 }
@@ -237,7 +236,7 @@ static void serial8250_enable_ms(struct uart_port *port)
         serial_out(up, UART_IER, up->ier);
 }
 
-static _INLINE_ void
+static void
 receive_chars(struct uart_8250_port *up, int *status, struct pt_regs *regs)
 {
         struct tty_struct *tty = up->port.info->tty;
@@ -312,7 +311,7 @@ receive_chars(struct uart_8250_port *up, int *status, struct pt_regs *regs)
         spin_lock(&up->port.lock);
 }
 
-static _INLINE_ void transmit_chars(struct uart_8250_port *up)
+static void transmit_chars(struct uart_8250_port *up)
 {
         struct circ_buf *xmit = &up->port.info->xmit;
         int count;
@@ -346,7 +345,7 @@ static _INLINE_ void transmit_chars(struct uart_8250_port *up)
                 serial8250_stop_tx(&up->port);
 }
 
-static _INLINE_ void check_modem_status(struct uart_8250_port *up)
+static void check_modem_status(struct uart_8250_port *up)
 {
         int status;
 
diff --git a/drivers/serial/crisv10.c b/drivers/serial/crisv10.c
index be12623d8544..89700141f87e 100644
--- a/drivers/serial/crisv10.c
+++ b/drivers/serial/crisv10.c
@@ -481,8 +481,6 @@ static char *serial_version = "$Revision: 1.25 $";
 #include "serial_compat.h"
 #endif
 
-#define _INLINE_ inline
-
 struct tty_driver *serial_driver;
 
 /* serial subtype definitions */
@@ -591,8 +589,6 @@ static void rs_throttle(struct tty_struct * tty);
 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
 static int rs_write(struct tty_struct * tty, int from_user,
                     const unsigned char *buf, int count);
-extern _INLINE_ int rs_raw_write(struct tty_struct * tty, int from_user,
-                            const unsigned char *buf, int count);
 #ifdef CONFIG_ETRAX_RS485
 static int e100_write_rs485(struct tty_struct * tty, int from_user,
                             const unsigned char *buf, int count);
@@ -1538,8 +1534,7 @@ e100_enable_rxdma_irq(struct e100_serial *info)
 
 /* the tx DMA uses only dma_descr interrupt */
 
-static _INLINE_ void
-e100_disable_txdma_irq(struct e100_serial *info)
+static void e100_disable_txdma_irq(struct e100_serial *info)
 {
 #ifdef SERIAL_DEBUG_INTR
         printk("txdma_irq(%d): 0\n",info->line);
@@ -1548,8 +1543,7 @@ e100_disable_txdma_irq(struct e100_serial *info)
         *R_IRQ_MASK2_CLR = info->irq;
 }
 
-static _INLINE_ void
-e100_enable_txdma_irq(struct e100_serial *info)
+static void e100_enable_txdma_irq(struct e100_serial *info)
 {
 #ifdef SERIAL_DEBUG_INTR
         printk("txdma_irq(%d): 1\n",info->line);
@@ -1558,8 +1552,7 @@ e100_enable_txdma_irq(struct e100_serial *info)
         *R_IRQ_MASK2_SET = info->irq;
 }
 
-static _INLINE_ void
-e100_disable_txdma_channel(struct e100_serial *info)
+static void e100_disable_txdma_channel(struct e100_serial *info)
 {
         unsigned long flags;
 
@@ -1599,8 +1592,7 @@ e100_disable_txdma_channel(struct e100_serial *info)
 }
 
 
-static _INLINE_ void
-e100_enable_txdma_channel(struct e100_serial *info)
+static void e100_enable_txdma_channel(struct e100_serial *info)
 {
         unsigned long flags;
 
@@ -1625,8 +1617,7 @@ e100_enable_txdma_channel(struct e100_serial *info)
         restore_flags(flags);
 }
 
-static _INLINE_ void
-e100_disable_rxdma_channel(struct e100_serial *info)
+static void e100_disable_rxdma_channel(struct e100_serial *info)
 {
         unsigned long flags;
 
@@ -1665,8 +1656,7 @@ e100_disable_rxdma_channel(struct e100_serial *info)
 }
 
 
-static _INLINE_ void
-e100_enable_rxdma_channel(struct e100_serial *info)
+static void e100_enable_rxdma_channel(struct e100_serial *info)
 {
         unsigned long flags;
 
@@ -1913,9 +1903,7 @@ rs_start(struct tty_struct *tty)
  * This routine is used by the interrupt handler to schedule
  * processing in the software interrupt portion of the driver.
  */
-static _INLINE_ void
-rs_sched_event(struct e100_serial *info,
-                                    int event)
+static void rs_sched_event(struct e100_serial *info, int event)
 {
         if (info->event & (1 << event))
                 return;
@@ -2155,8 +2143,9 @@ add_char_and_flag(struct e100_serial *info, unsigned char data, unsigned char fl
         return 1;
 }
 
-extern _INLINE_ unsigned int
-handle_descr_data(struct e100_serial *info, struct etrax_dma_descr *descr, unsigned int recvl)
+static unsigned int handle_descr_data(struct e100_serial *info,
+                                      struct etrax_dma_descr *descr,
+                                      unsigned int recvl)
 {
         struct etrax_recv_buffer *buffer = phys_to_virt(descr->buf) - sizeof *buffer;
 
@@ -2182,8 +2171,7 @@ handle_descr_data(struct e100_serial *info, struct etrax_dma_descr *descr, unsig
         return recvl;
 }
 
-static _INLINE_ unsigned int
-handle_all_descr_data(struct e100_serial *info)
+static unsigned int handle_all_descr_data(struct e100_serial *info)
 {
         struct etrax_dma_descr *descr;
         unsigned int recvl;
@@ -2230,8 +2218,7 @@ handle_all_descr_data(struct e100_serial *info)
         return ret;
 }
 
-static _INLINE_ void
-receive_chars_dma(struct e100_serial *info)
+static void receive_chars_dma(struct e100_serial *info)
 {
         struct tty_struct *tty;
         unsigned char rstat;
@@ -2292,8 +2279,7 @@ receive_chars_dma(struct e100_serial *info)
         *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart);
 }
 
-static _INLINE_ int
-start_recv_dma(struct e100_serial *info)
+static int start_recv_dma(struct e100_serial *info)
 {
         struct etrax_dma_descr *descr = info->rec_descr;
         struct etrax_recv_buffer *buffer;
@@ -2348,11 +2334,6 @@ start_receive(struct e100_serial *info)
 }
 
 
-static _INLINE_ void
-status_handle(struct e100_serial *info, unsigned short status)
-{
-}
-
 /* the bits in the MASK2 register are laid out like this:
    DMAI_EOP DMAI_DESCR DMAO_EOP DMAO_DESCR
    where I is the input channel and O is the output channel for the port.
@@ -2454,8 +2435,7 @@ rec_interrupt(int irq, void *dev_id, struct pt_regs * regs)
         return IRQ_RETVAL(handled);
 } /* rec_interrupt */
 
-static _INLINE_ int
-force_eop_if_needed(struct e100_serial *info)
+static int force_eop_if_needed(struct e100_serial *info)
 {
         /* We check data_avail bit to determine if data has
          * arrived since last time
@@ -2499,8 +2479,7 @@ force_eop_if_needed(struct e100_serial *info)
         return 1;
 }
 
-extern _INLINE_ void
-flush_to_flip_buffer(struct e100_serial *info)
+static void flush_to_flip_buffer(struct e100_serial *info)
 {
         struct tty_struct *tty;
         struct etrax_recv_buffer *buffer;
@@ -2611,8 +2590,7 @@ flush_to_flip_buffer(struct e100_serial *info)
         tty_flip_buffer_push(tty);
 }
 
-static _INLINE_ void
-check_flush_timeout(struct e100_serial *info)
+static void check_flush_timeout(struct e100_serial *info)
 {
         /* Flip what we've got (if we can) */
         flush_to_flip_buffer(info);
@@ -2741,7 +2719,7 @@ TODO: The break will be delayed until an F or V character is received.
 
 */
 
-extern _INLINE_
+static
 struct e100_serial * handle_ser_rx_interrupt_no_dma(struct e100_serial *info)
 {
         unsigned long data_read;
@@ -2875,8 +2853,7 @@ more_data:
         return info;
 }
 
-extern _INLINE_
-struct e100_serial* handle_ser_rx_interrupt(struct e100_serial *info)
+static struct e100_serial* handle_ser_rx_interrupt(struct e100_serial *info)
 {
         unsigned char rstat;
 
@@ -2995,7 +2972,7 @@ struct e100_serial* handle_ser_rx_interrupt(struct e100_serial *info)
         return info;
 } /* handle_ser_rx_interrupt */
 
-extern _INLINE_ void handle_ser_tx_interrupt(struct e100_serial *info)
+static void handle_ser_tx_interrupt(struct e100_serial *info)
 {
         unsigned long flags;
 
@@ -3621,9 +3598,8 @@ rs_flush_chars(struct tty_struct *tty)
         restore_flags(flags);
 }
 
-extern _INLINE_ int
-rs_raw_write(struct tty_struct * tty, int from_user,
-          const unsigned char *buf, int count)
+static int rs_raw_write(struct tty_struct * tty, int from_user,
+                        const unsigned char *buf, int count)
 {
         int     c, ret = 0;
         struct e100_serial *info = (struct e100_serial *)tty->driver_data;
@@ -4710,7 +4686,7 @@ rs_open(struct tty_struct *tty, struct file * filp)
  * /proc fs routines....
  */
 
-extern _INLINE_ int line_info(char *buf, struct e100_serial *info)
+static int line_info(char *buf, struct e100_serial *info)
 {
         char    stat_buf[30];
         int     ret;
diff --git a/drivers/serial/m32r_sio.c b/drivers/serial/m32r_sio.c
index 876bc5e027bb..e9c10c0a30fc 100644
--- a/drivers/serial/m32r_sio.c
+++ b/drivers/serial/m32r_sio.c
@@ -248,17 +248,17 @@ static void sio_error(int *status)
 
 #endif /* CONFIG_SERIAL_M32R_PLDSIO */
 
-static _INLINE_ unsigned int sio_in(struct uart_sio_port *up, int offset)
+static unsigned int sio_in(struct uart_sio_port *up, int offset)
 {
         return __sio_in(up->port.iobase + offset);
 }
 
-static _INLINE_ void sio_out(struct uart_sio_port *up, int offset, int value)
+static void sio_out(struct uart_sio_port *up, int offset, int value)
 {
         __sio_out(value, up->port.iobase + offset);
 }
 
-static _INLINE_ unsigned int serial_in(struct uart_sio_port *up, int offset)
+static unsigned int serial_in(struct uart_sio_port *up, int offset)
 {
         if (!offset)
                 return 0;
@@ -266,8 +266,7 @@ static _INLINE_ unsigned int serial_in(struct uart_sio_port *up, int offset)
         return __sio_in(offset);
 }
 
-static _INLINE_ void
-serial_out(struct uart_sio_port *up, int offset, int value)
+static void serial_out(struct uart_sio_port *up, int offset, int value)
 {
         if (!offset)
                 return;
@@ -326,8 +325,8 @@ static void m32r_sio_enable_ms(struct uart_port *port)
         serial_out(up, UART_IER, up->ier);
 }
 
-static _INLINE_ void receive_chars(struct uart_sio_port *up, int *status,
-        struct pt_regs *regs)
+static void receive_chars(struct uart_sio_port *up, int *status,
+                          struct pt_regs *regs)
 {
         struct tty_struct *tty = up->port.info->tty;
         unsigned char ch;
@@ -400,7 +399,7 @@ static _INLINE_ void receive_chars(struct uart_sio_port *up, int *status,
         tty_flip_buffer_push(tty);
 }
 
-static _INLINE_ void transmit_chars(struct uart_sio_port *up)
+static void transmit_chars(struct uart_sio_port *up)
 {
         struct circ_buf *xmit = &up->port.info->xmit;
         int count;
diff --git a/drivers/serial/sunsu.c b/drivers/serial/sunsu.c
index 7fc3d3b41d18..9fe2283d91e5 100644
--- a/drivers/serial/sunsu.c
+++ b/drivers/serial/sunsu.c
@@ -102,9 +102,7 @@ struct uart_sunsu_port {
 #endif
 };
 
-#define _INLINE_
-
-static _INLINE_ unsigned int serial_in(struct uart_sunsu_port *up, int offset)
+static unsigned int serial_in(struct uart_sunsu_port *up, int offset)
 {
         offset <<= up->port.regshift;
 
@@ -121,8 +119,7 @@ static _INLINE_ unsigned int serial_in(struct uart_sunsu_port *up, int offset)
         }
 }
 
-static _INLINE_ void
-serial_out(struct uart_sunsu_port *up, int offset, int value)
+static void serial_out(struct uart_sunsu_port *up, int offset, int value)
 {
 #ifndef CONFIG_SPARC64
         /*
@@ -316,7 +313,7 @@ static void sunsu_enable_ms(struct uart_port *port)
         spin_unlock_irqrestore(&up->port.lock, flags);
 }
 
-static _INLINE_ struct tty_struct *
+static struct tty_struct *
 receive_chars(struct uart_sunsu_port *up, unsigned char *status, struct pt_regs *regs)
 {
         struct tty_struct *tty = up->port.info->tty;
@@ -395,7 +392,7 @@ receive_chars(struct uart_sunsu_port *up, unsigned char *status, struct pt_regs
         return tty;
 }
 
-static _INLINE_ void transmit_chars(struct uart_sunsu_port *up)
+static void transmit_chars(struct uart_sunsu_port *up)
 {
         struct circ_buf *xmit = &up->port.info->xmit;
         int count;
@@ -431,7 +428,7 @@ static _INLINE_ void transmit_chars(struct uart_sunsu_port *up)
                 __stop_tx(up);
 }
 
-static _INLINE_ void check_modem_status(struct uart_sunsu_port *up)
+static void check_modem_status(struct uart_sunsu_port *up)
 {
         int status;
 
diff --git a/drivers/tc/zs.c b/drivers/tc/zs.c
index 6756d0fab6fe..2dffa8e303b2 100644
--- a/drivers/tc/zs.c
+++ b/drivers/tc/zs.c
@@ -186,8 +186,6 @@ static struct tty_driver *serial_driver;
 #define RS_STROBE_TIME 10
 #define RS_ISR_PASS_LIMIT 256
 
-#define _INLINE_ inline
-
 static void probe_sccs(void);
 static void change_speed(struct dec_serial *info);
 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
@@ -344,14 +342,13 @@ static inline void rs_recv_clear(struct dec_zschannel *zsc)
  * This routine is used by the interrupt handler to schedule
  * processing in the software interrupt portion of the driver.
  */
-static _INLINE_ void rs_sched_event(struct dec_serial *info, int event)
+static void rs_sched_event(struct dec_serial *info, int event)
 {
         info->event |= 1 << event;
         tasklet_schedule(&info->tlet);
 }
 
-static _INLINE_ void receive_chars(struct dec_serial *info,
-                                   struct pt_regs *regs)
+static void receive_chars(struct dec_serial *info, struct pt_regs *regs)
 {
         struct tty_struct *tty = info->tty;
         unsigned char ch, stat, flag;
@@ -441,7 +438,7 @@ static void transmit_chars(struct dec_serial *info)
                 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
 }
 
-static _INLINE_ void status_handle(struct dec_serial *info)
+static void status_handle(struct dec_serial *info)
 {
         unsigned char stat;
 
diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h
index 222faf97d5f9..0c6169fff366 100644
--- a/include/linux/tty_flip.h
+++ b/include/linux/tty_flip.h
@@ -7,14 +7,8 @@ extern int tty_insert_flip_string_flags(struct tty_struct *tty, unsigned char *c
 extern int tty_prepare_flip_string(struct tty_struct *tty, unsigned char **chars, size_t size);
 extern int tty_prepare_flip_string_flags(struct tty_struct *tty, unsigned char **chars, char **flags, size_t size);
 
-#ifdef INCLUDE_INLINE_FUNCS
-#define _INLINE_ extern
-#else
-#define _INLINE_ static __inline__
-#endif
-
-_INLINE_ int tty_insert_flip_char(struct tty_struct *tty,
-                                   unsigned char ch, char flag)
+static inline int tty_insert_flip_char(struct tty_struct *tty,
+                                       unsigned char ch, char flag)
 {
         struct tty_buffer *tb = tty->buf.tail;
         if (tb && tb->active && tb->used < tb->size) {
@@ -25,7 +19,7 @@ _INLINE_ int tty_insert_flip_char(struct tty_struct *tty,
         return tty_insert_flip_string_flags(tty, &ch, &flag, 1);
 }
 
-_INLINE_ void tty_schedule_flip(struct tty_struct *tty)
+static inline void tty_schedule_flip(struct tty_struct *tty)
 {
         unsigned long flags;
         spin_lock_irqsave(&tty->buf.lock, flags);